Research/Sitter/MAGNDATA / 1.1.18_NdFe3B4O12.mcif

NdFe₃B₄O₁₂

MAGNDATA entry 1.1.18 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 13.5 K (−260 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	R321′(00γ)t0s
Point group	321′
Parent space group	R 32 No. 155
Repeats every	0.67 cells along c (not a whole number: that's what incommensurate means)
Propagation	[0 0 1.502] 1k
Cell	a 9.594 · b 9.594 · c 7.603 Å · α 90° · β 90° · γ 120°
Transition	13.5 K (−260 °C)
Measured at	5 K
Magnetic ions	Fe, Nd
Largest moment component	4.82 μ_B
Method	NSD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in R321′(00γ)t0s →

Atom sites · 7 sites · CSV

site	element	x	y	z
Nd1	Nd	0	0	0
Fe1	Fe	0.5505	0	0
B1	B	0	0	0.5
B2	B	0.4468	0	0.5
O1	O	0.8586	0	0.5
O2	O	0.5903	0	0.5
O3	O	0.4533	0.1448	0.5182

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

M. Janoschek et al. PHYSICAL REVIEW B (2010) · doi:10.1103/PhysRevB.81.094429

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.18_NdFe3B4O12.mcif from MAGNDATA · entry page

sha256 of this copy: bf5e87b4f08570e9cdbdd8691baf05b175093cf1d78b5905aa640adc087a5045
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.18_NdFe3B4O12.mcif.